Background Updates: Spread them over the hour. Props Pento. Fixes #25833 for trunk

Built from https://develop.svn.wordpress.org/trunk@26149


git-svn-id: http://core.svn.wordpress.org/trunk@26060 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/upgrade.php

@@ -405,6 +405,9 @@ function upgrade_all() {
 	if ( $wp_current_db_version < 25824 )
 		upgrade_370();
 
+	if ( $wp_current_db_version < 26148 )
+		upgrade_372();
+
 	maybe_disable_link_manager();
 
 	maybe_disable_automattic_widgets();
@@ -1222,6 +1225,18 @@ function upgrade_370() {
 		wp_clear_scheduled_hook( 'wp_auto_updates_maybe_update' );
 }
 
+/**
+ * Execute changes made in WordPress 3.7.2.
+ *
+ * @since 3.7.2
+ * @since 3.8.0
+ */
+function upgrade_372() {
+	global $wp_current_db_version;
+	if ( $wp_current_db_version < 26148 )
+		wp_clear_scheduled_hook( 'wp_maybe_auto_update' );
+}
+
 /**
  * Execute network level changes
  *

wp-includes/update.php

@@ -584,6 +584,8 @@ function wp_schedule_update_checks() {
 			$next += 12 * HOUR_IN_SECONDS;
 		}
 		$next = $next - get_option( 'gmt_offset' ) * HOUR_IN_SECONDS;
+		// Add a random number of minutes, so we don't have all sites trying to update exactly on the hour
+		$next = $next + rand( 0, 59 ) * MINUTE_IN_SECONDS;
 		wp_schedule_event( $next, 'twicedaily', 'wp_maybe_auto_update' );
 	}
 }

wp-includes/version.php

@@ -11,7 +11,7 @@ $wp_version = '3.8-alpha-26127';
  *
  * @global int $wp_db_version
  */
-$wp_db_version = 25824;
+$wp_db_version = 26148;
 
 /**
  * Holds the TinyMCE version